Improvement in rock-drilling machines



illlltiltll sins instant dffitt JACOB W. SPANGLER, OF JACKSON TOWNSHIRAND WILLIAM L. BOYD OFYORK, PENNSY LVANIA.

Letters Patent No. 114,617, dated May 9, 1871.

IMPROVEMENT IN ROCK-DldlLLlNG MACHINES.

The Schedule referred to in these Letters Patent and making part of the name.

To all whom it may concern Be it known that we, JAcoB W; Smncnnn, of Jackson township, in the county of York and State of Pennsylvania, and \VILLIAM L. BOYD, of York, in the county and State aforesaid, have invented a new and improved Rock-Drill; and we do hereby declare the followingto be a full, clear, and exact description of the same, reference being bad to the accompanying drawing making a part of this specification,

I in which Figure 1 is a side elevation,-partly in section;

Figure 2 is a front elevation;

Figure 3 is a side elevation of the worm; and

Figure 4 is a view of one of the props.

This invention relates to a mechanism by which three separate movements are imparted to the drill, via, an intermittent rotary motion for cutting a cylindr'ical hole, a plunging vertical descent alternating with the necessary ascents for cutting the rock, and a gradual vertical descent for feeding the drill'down to its work.

Referring to the drawing- The mechanism for imparting the intermittent motion to the drill a consists of an annular ratchet, I), fixed on the drill near its upper end, and a pawl, c, pivoted toa frame, cl, that is attached to the standardA of the frame. .As the drill rises the ratchet strikes the pawl and rotates the drill.

We are aware that there is nothing new in this part of the apparatus.

The mechanism for imparting the vertical reciprocating motionv to the drill consists of a horizontal shaft, 0, which is rotated by any suitable arrangement of gearing; a disk, f, fixed on one end of the shafts", and bearing a wrist-pin, g a vibrating frame, It, connected With'thewrist-p'in g a serrated vertical sliding rod, t, jointed at its lower end to the top of the frame It, and guided by lugs Jo, which project from the standard A; and a collar, 1, inclosing the drill a just beneath the ratchet b, and connected with the-serrated rod or rack t in a manner to be hereinafter described.

The rotation of the disk f communicates the requisite reciprocating plunging motion to the drill through the medium of the above-enumerated parts.

The mechanism for imparting a gradual vertical descent to the drill consists of a toothed whcehm, mounted on a pin projecting from alug, n, that incloscs the rack i, said mg itself projecting from the collarl that incloses the drill a; a spiral worm, 0,

secured to the inner side of the wheel on and en-- gaging with the rack t; and a pawl, 12,- pivoted to the sliding frame d.

As the wheel on rises withthe drill it strikes. the pawl 12, and is by that rotated a certain distance, which rotation causes the worm a to' work downward along the rack t and carry the drill a downward with, it.

\Vhenever this descent of the drill is greater than the distance the drill is able to penetrate the rock at the next stroke, the drill yields upwardly as the wrist-- pin g approaches the lowest point of its-revolution, by reason of a spiral spring, q, whi ch incloses a rod, '1', that is jointed to said wrist-pin and extends upward into the frame h, the spring-q being within said frame, and bearing against thelower end of the same.

By this arrangement the disk f is enabled to perform its revolution without straining or breaking the other parts of the apparatus.

The mechanism we have just described adjusts itself to rocks of various degrees of hardness, in the following manner: 1

.Vhenever the 'drill yields upwardly, in the way explained above, its next succeeding rise is lessened by the amount of? such yielding, and in proportion as the distance the drill rises is decreased the extent' to which the worm 0 descends alongthe rack t is decreased, because the wheel at continues for a shorter time in contact with the pawl 11; and in proportion .as the descent of the worm isdecreased the additional descent which the worm imparts to the drill is decreased also.

The sliding frame (Z, before alluded to, is provided with a lug, s, that projects from the lower end of said frame in front of the standard A.

7 As the collar 1 descends it strikes the lug s anddraws the frame (I downward, so as to make the pawls c and 1; follow the drill downward.

A spring, t, is attached to the top and'rear side of the framed, which spring is pressed by a set-screw, it, against the standard A.

The office of the spring and screw is, by pressure against the standard, to prevent .the sliding frame being carried downward too far by the stroke of the collar Z.

The wheel on should be held upon its shaft in such a manner that it may be readily slipped backward, so as to separate the worm o from the rack i when it is required to raise the drill outof the bore for anv purpose. I

Props c, having flanges 20 extending from each side of their tops, the distance between which flanges should be a trifle greater than the width of the rear rack i, collar 1, wheel m, worm o, and drill a, asspe i fied. I

2. The combination of the frame'h, rod r, spring q, and disk f, as described.

3. The frame d, lug s, spring t, and set-screw u, in combination with the standard A, as set forth.

4. The prop 12, provided with flanges w, as explained.

JACOB w. SPANGLER. WM. L. BOYD.

- Witnesses to the signature of SPANG-LER:

J. W. BRAFFT, Tnos. J. WILHELM.

Witnesses to the signature of BOYD:

' W. J. S'rmn,

H. CLAY MeIn'rYrm. 

